The Panasonic G9 looks like a slight step up over the GH5 in DPReviews studio scene, but the Olympus OM-D EM1 Mark II seems to be king of the hill for m43 cameras still when it comes to low light performance. None of these cameras rival the Fujifilm X-T2, but Panasonic and Olympus would like you to believe they can keep up. Maybe the Panasonic GH5s will blow everything away but the a7S. Of course, there are very few instances where you should need above 6400 ISO or even 3200 ISO if you have nice fast glass, which m43 cameras have plenty.
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Panasonic Lumix DC-G9: B&H Photo / Amazon / Adorama
Panasonic Leica DG 200mm f/2.8: B&H Photo / Amazon / Adorama
Panasonic GH5: B&H Photo / Amazon / Adorama
Panasonic GH5 Film Maker Kit: B&H Photo
Olympus OM-D E-M1 Mark II Amazon / B&H Photo / Adorama